<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="" method="post">
    选择城市：<select name="" id="city">
    <option value="">长沙</option>
    <option value="">武汉</option>
    <option value="">广州</option>
    <option value="">深圳</option>
    <option value="">上海</option>
</select>

    选择区县：<select name="" id="1">
    <option value="">江夏</option>
    <option value="">东西湖</option>
    <option value="">洪山</option>
    <option value="">武昌</option>
    <option value="">汉口</option>
</select>
</form>
</body>
</html>